INFICON LDS3000 Modular Leak Detector Interface description - Manual (Page 54)

54 Fieldbus Communication
6.5.4 ASCII Protocol specific
6.5.5 LD Protocol specific
Error Possible Reason Solution
IO1000 does not reply /
Modul1000 replies after
several command with „E10“ „Carriage Return“ at the
end of the command is
missing
Finish all commands with „Carriage Return“ (ASCII
0dhex / 13dez)
Modul1000 replies with error
message to the first
command only, following
commands are interpreted
correctly
Receiving buffer of the
LDS3000 was not empty
before sending the first
command (e.g. by plugging
in the RS232 cable during
operation)
In the ASCII protocol the LDS3000 has not time out
function which will empty the receiving buffer
automatically. Therefore, the buffer should be
emptied before the first command by sending of
ESC, ^C or ^X
Error Possible Reason Solution
IO1000 does not reply
Wrong Address Always use Address 1 in LD protocol.
Other protocol errors
Try to use NOP command (05hex 04hex 01hex
00hex 00hex 77hex) first, to check if connection
works in general. The answer should be 02hex
05hex ??hex ??hex 00hex 00hex ??hex
IO1000 replys with CRC
error (error code 1)
Wrong CRC calculation
Check you CRC code calculation. See example C
source file "CRC_calculation.c" provided by
INFICON. Check your code with unit test function in
this source code file.